Pump



Feb. 2l, 1939.

D. GREGG PUMP Filed April 29, 195'.

ffl I/ INVENTOR. Dm//d Gre BY s A ATTORNEY.

Patented Feb. 21, 1939 1 PUMP David Gregg, Caldwell, N. J., assignor to Eclipse Aviation Corporation, East Orange, N. J., a, corporation of New Jersey Application April 29, 1937, Serial No. 139,791

Claims. (Cl. 23o-207) This invention relates to fluid pumps, and more particularly to gas or air pumps. A principal object of the invention is to provide a fluid pump in which lubricating oil will not 5 be drawn into the pump by suction.

Another object of the invention is toprovide an air pump adapted to be secured to a casing containing lubricant in which the air pressure of the pump is supplied to the pump drive shaft intermediate the casing and the pump.`

VAnother object of the invention is to provide a. reversible pump with a means for preventing oil being drawn into the pump in either direction ol' operation.

Another object of the invention is to provide a pump with a two part housing having aligned passages in which means are provided for inserting check valves in the passages prior to assembly of the housing and wherein they will be retained by the coaction of thehousing parts.

- Another objectfof the invention is to supply lubricantto the pump under pressure in a manner to control the `quantity of lubricant supplied.

Other objects of the invention will be apparent from the following description in connection with` which a preferred embodiment oi the invention has been illustrated in the accompanying drawing. in which: y

`Flg.,1 is a side elevation of the pump;

Fig. 2 is an end view partly in section;

Fig. 3-is a 'view'taken on line 3-3 of Fig. 1;

Fig. 4 is aview taken on line 4--4 of Fig. 3; and

Fig. 5 ls a view taken on line 5 5 of Fig. l.

Referring to the drawing, the pump casing comprises 'a part `I for enclosing the rotor 5 and a part 2 for supporting the drive shaft 3 through the bearingl. The part 2 is positioned with respect to part- I byv dowels 6 and is held in the assembled position by screws 1. The oil regulating means, hereinafter described, is illustrated .in combination with a pump of the vane type, but it is apparent that it is equally useful with any other type o f pump.

The pump is adapted to be installed on a fixed part Aof an engine or other prime mover and to be driven by a shaft having a sliding fit upon the hexagonal shaft 3. The pump may be driven in either direction of rotation and if the rotation of rotor 5 be in a clockwise direction as viewed in Fig. 5, vanes II will draw air from port I2l through recess I3 and discharge it through recess I4 and port Iii.` If they rotation be in the reverse direction the air iiow will be reversed, port I6 will become the intake port and port I2 will become the discharge port.

In air pumps for certain uses, it is desirable to eliminate oil from the discharge line and if the pump be installed on an engine the lubricating oil v.passes from the engine into compartment I1 from where it is drawn into .the suction side of 5 the pump and discharged through the outlet of the pump. I

To eliminate the ow of engine oil into compartment I1, means has been provided to connect the compartment with the pressure side of the 10 pump regardlessof `the'direction of air flow. For this purpose passages 2I and 22 are provided in casing part I which communicate withK recesses l `I3 and I4 respectively and terminate in enlarged openings 23 and 24 within which are check valves l5 25 and 26 urged upontheir seats by springs 21 and 28.

Casing part 2 is provided with passages 29 and 30 'which are aligned with recesses 23 and 24, and are somewhat smaller than the recesses in 20 order lto retain the springs within the recesses when the pump is assembled. Passages 23 and 1 30 communicate` with crosspassages 32 and 33 which terminate within the compartment I1.

It will be seen that if rotation is clockwise, as- 25 viewed in Fig. 5, recess I4 will be the discharge side of the pump and check valve 26 will be open to admit pressure to the compartment and prevent the entrance of engine oil therein. At the same time check valve 25 will be on its seat be- 30 cause of spring 21 and the suction in passage 2l.

If the direction of the pump should be reversed, recess I3 will be the pressure side of the pump and check valve 25 will open tosupply pressure tothe compartment and check valve 26 will be 35 closed. The improved pump construction, as described above, will insure a supply of pressure adjacent the drive shaft 3 regardless of the directionlof pump .rotation and leakage of engine oil into the pump will be prevented. 'I'he quantity 40 of air passing into the compartment may be controlled either by the proper selection of check valve springs or byvarying the size of the pasfsages. I

It is desirable tohave some lubrication of the pump, but it is preferred to supply this in very small quantities and by a pressure system that may be accurately controlled. To this end an oil inlet 38 is provided which may be connected to any convenient source of oil pressure (not shown). `The oil passes through restricted passage 39 into an annular recess 40 which is formed in the housing 2. A sleeve 4I is pressed into the housing and has an inwardly extending flange 42 which closely surrounds rotor extension 43. The

sleeve is provided with a passage 44 in communication with recess Y 40 and terminating against the face of ring 46 which is secured to the.rotor 4by pin 41 and pressed against flange 42 by springs 46. The mating surfaces of ring 46 and flange 42 are preferably accurately ground or lapped to true plane surfaces. A small recess 5| is formed in ring 41 which aligns once every revolution with the opening of passage 44. The ring 46 has a slight clearance with respect to sleeve 4I to permit the oil passing between the ring and disk to flow around the ring and into the body `of the pump. The oil flow into the pump may be controlled by varying the oil pressure, the size of restricted passage 39, the size of recess 5l, or by varying the force of springs 48. If the foregoing .conditions are maintained constant, the flow of oil to the pump is independent of the amount of oil or oil vapor in chamber l1 and may be very accurately.

determined. so as to practically eliminate the presence of oil in the discharged air.

While a preferred embodiment of the invention has been illustrated and described, it is understood that this showing and description are illustrative. only and the invention is not regarded as limited to thevform shown and described, or otherwise, except by the terms of the following claims.

What is claimed is:

1. In a fluid pump, a two part casing, one part of which has a pair of passageways formed therein either of which is adapted to act as the inlet or discharge passage according to the direction .o f pump movement, a pair.` of conduits in the casing, one of which is in communication with each passageway and terminating in a recess, a second casing partadaptedto mate with the rst part, a pump shaft projecting through said second casing part, conduits in said second part adapted to be aligned with said recesses and terminating adjacent the projecting shaft, a check valve in each of said recesses, and means for clamping said casing parts together to retain the check valves in said recesses when the pump is assembled.

2. In a fluid pump, a two part casing, one part of which has a pair of passageways formed therein either of which is adapted to act as the inlet' or discharge passage according tothe direction of pump movement, a pair of conduits in the casing, one of which is in communication with each passageway and terminating in a recess, a second casing part adapted to mate with the first part, a`

pumpshaft projecting through said second casing part, conduits in said second part adapted to be 3. In a fluid pump, a casing, a rotor, a drive shaft for the rotor projecting through the casing, a flange secured to the casing and closely encircling the shaft, alubricant passage in said flange terminating in the face of the flange, a ring having a face in contact with the face of the fiange and drivably secured to said shaft, means for introducing lubricant under pressure to said lubricant passage, means forming a passageway between the ring and the casing to permit lubricant to flow into contact with the rotor, and means for conducting fluid from the pressure side of the pump to a portion of the shaft located outwardly of the flange.

4. In a fluid pump, a casing, a rotor, a drive shaft for the rotor projecting through the casing, a flange secured to the casing and closely encircling the shaft, a lubricant passage in said flange terminating in the face of the flange, a ring having a face in contact with the face of the flange and drivably and slidably secured to said shaft, means forintroducing lubricant under pressure to said lubricant passage, means forming a passageway betweenithe ring and the casing to permit lubricant to flow into contact with the rotor, resilient means urging said ring toward said flange, and means for conducting fluid from theV pressure side of the pump to a portion of the shaft located outwardly of the flange.

5. In a fluid pump, a casing having an end wall, -a rotor, a drive shaftifor the rotor extending through the end wall, a flange fixed to the casing 'and extending inwardly toward said shaft, said flange having a flat face, a ring drivably secured to the shaft and axially slidable thereon,

said ring having a flat face contiguous with the face of the flange, a lubricant passage vin the flange terminating in the face thereof, said ring having a recess therein adapted to align with the lubricant passage once in each revolution of the shaft, means for urging said ring towardsaid flange, means forming a passageway between the ring and casing permitting lubricant flow from the periphery of said ring into contact with the rotor, and means for conducting uid from the pressure side of the pump to a portion of the shaft located outwardly of the ange.

' DAVID. GREGG. 

